diff --git a/tests/config/test_util.py b/tests/config/test_util.py
new file mode 100644
index 0000000000..10363e3765
--- /dev/null
+++ b/tests/config/test_util.py
@@ -0,0 +1,53 @@
+# -*- coding: utf-8 -*-
+# Copyright 2021 The Matrix.org Foundation C.I.C.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from synapse.config import ConfigError
+from synapse.config._util import validate_config
+
+from tests.unittest import TestCase
+
+
+class ValidateConfigTestCase(TestCase):
+ """Test cases for synapse.config._util.validate_config"""
+
+ def test_bad_object_in_array(self):
+ """malformed objects within an array should be validated correctly"""
+
+ # consider a structure:
+ #
+ # array_of_objs:
+ # - r: 1
+ # foo: 2
+ #
+ # - r: 2
+ # bar: 3
+ #
+ # ... where each entry must contain an "r": check that the path
+ # to the required item is correclty reported.
+
+ schema = {
+ "type": "object",
+ "properties": {
+ "array_of_objs": {
+ "type": "array",
+ "items": {"type": "object", "required": ["r"]},
+ },
+ },
+ }
+
+ with self.assertRaises(ConfigError) as c:
+ validate_config(schema, {"array_of_objs": [{}]}, ("base",))
+
+ self.assertEqual(c.exception.path, ["base", "array_of_objs", "<item 0>"])
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